Stock bar feeder



July 21,1931. RJMLLER 1,815,574

STOCK BAR FEEDER Filed May 24, 1930 2 Sheets-Sheet 1 Zbp/fl 1/ Maiden 5/ 5mm 1 m A July 21, 1931. R; J. MILLER STOCK BAR FEEDER Filed May 24, 19.30

2 Sheejts-Sheet 2 ,"lhis inveiition relatesto a device common- Patented July 21, 1931 P N T -STATES niiLri-r a. MILLER,- or ivmnison, wIscoNsI-N, nssienon 50 e snonr Mirgnmmcon- PnNY, 0F MADlfioN; WISCONSIN,

LA. neuronrron on vvascousnxr sTooK BA-R FEEI J ER A ppliea t ion rfiled- May 24,

known asa bar feed attachment forturret flathes, engine 'latlies, screw machines, and "similar machinetools, wherein; abar of stock is fed forwardly through the hollow spindle Qand itjhe .chuckandis operated on by a cutt ingpr,tlireading tool on the turret or cross e'jof themachine. 'A known type of powfiero perated barfeed consists of a vertical the machine, two parallel guide rails mounted at. their onterends-on said support and at their-inner. ends-on the headstock of the mach'ine .aEst'ockYbar carrier slidably mounted on "the rails, a rotatable coarsepitch feed screwiengaged With thecarrier, and a friczt'iongclutch .for rotating the feed screw in hem-directions, theforwal'd rotationbringing mp the carrier .and advancing the stock to Qtion returning the carrier for a new grip on --.the.stock.

. heingopeirated on, the rapid rotation of the T ie s tlocl; bar bythe chuck sets lupiconsiderable lateral yihration of the trailing end of the stock bar that is mounted in the carrier,

and this vibration is transmitted throughthe A v cas1ng l3 are anuinberofradially entend ng jbosses, l8, six in -l u nber as herein shown, but

carrier to theguide rails on which the carlides qaiid to the rearsupport of the .gniderails. I I i I g'lhe main object. of the present ilIlVGIltlOIl has been to provide an improved bar feed, of

. thistype whereinthe lateral vibrat ions of the stock bai vvill be absorbed :in the bar te d carrier itself'and thus will not to any {appreciable extent, transmitted to the guide rails and rail support.

1 One} racti cal and improved enibodimcntkof the principle of the invention is illustrated in theaccompanying drawings, in which Fig. 1 isa side el'eva tion of the support, guide rails (broken off) and slidable bar feed mounted on the guide rails.

Fig. 2 is a top plan View of the parts appearing in Fig. 1. I

Fig. 3 is an enlarged end elevation, partly in transverse section, of the bar feeder.

Fig. 4 is an enlarged side elevation, partly in longitudinal section, of the bar feeder.

lsiipport mounted some distance in rear of ;Clesir ed position, and the reverse rota- 193 0. I Serial No.

"F 5 is a side elevationof the rotating barrel of the bar feeder, shovvinga lubricat s e tu e r I Referringfto thedravvi'ng's, l Ojdesign'at'es a postmounted 'ontheiloor aindfa't itsjuip'per' end equipped with a crosshead I1 inwhich are securelymounted the outer .ends of a pa'ir of parallel spaced guide rails 12,;jthejinner ends of saidrails being properly supported on tli-erear end of thefheadstbbk offa lathe 1 or similar machine todl.

ing. formed withan integral depending web 14 in which latter arecastparallel tubular bearing members 15 that'slidablyreston the u d rai 12- .l l ayb w n. a id i h y belowft-hehearings 1'5'is an internally thread ed jhearing ltl hich is-engagedby a fee d Wh re a stocklbarof considerable length'is j screw 17, land 2 said'screw "being j ournailed at its outer, end in the cross head ll andat its inner'end being preferably poweroperated through light. friction clutch driven by anioving part of the machine.

Equally spaced around theperiphery offthe greater 'or less number may be employed.

j ThGSQbOSSGS fare-axially, boredto for in cylinders in which are sflidahly \n ounted cham- Cplungers 19 thrustsprlngs =20 which ,their inner ends abut against, the bottomsof the chambers and-fat their ;outer ends are fifo'oted against caps 21 screwed into the tap- '24 i fifietdb v fiattenedetthe p ints, when it is contacted b theinner endear the plungbered plungerslS). ln the chambers of the ,1 floating sleeve 24 and casing 13, as clearly shown in Fig. 4, and at its other end receives a removable collar 28 secured thereon by set screws 29, the lower ends of which set screws enter holes 30 in the barrel 26. The collar 28 also overlaps one end of the sleeve 24 and casing 13, thereby, in cooperation with the head 27 locking the sleeve 24 within the casing. To prevent loosening and backing out of the set screws 29 under the rapid rotary movement of the barrel 26, the collar 28 is preferably formed with a peripheral groove to take a locking wire 31.

The head 27 of the barrel is formed with a grou of equally spaced internally threaded L radial bores 32, herein shown as four in number, although a greater or less number may be employed. Screwed into the bores 32 are threaded clamp screws 33, the inner ends of which are adapted to grip the stock bar, such for instance as a round bar of steel shown in dotted lines at B. Since the four clamp screws 33 are independently adjustable, the stock barcan be securely gripped, even if its axis may not coincide exactly with the axis of the feed device.

Referring to Fig. 5, in the surface of the barrel 26 are formed end and intermediate oil grooves 34 and 35 by which the bearing of the barrel 36 in the sleeve 24 is thoroughly lubricated by oil flowing through the duct 25.

In the operation of the device, after the work has been gripped in the manner described, the feed screw 17 is rotated, and the stock bar is advanced, usually against a turret stock stop, for the threading or cutting thereof; the light friction clutch driving the feed screw slipping until a machined section of the bar has been cut off, whereupon the stock feeder is further advanced to a new position. During the rapid rotation of the trailing end of the stock bar, the lateral v1 brations of the latter are manifestly absorbed by the cushioning springs 20 and without any drag on the free rotation of the bar. This prevents the transmission of any severe or substantial vibrations to the guide rails and its support, and thus enables the latter parts to be made lighter than heretofore, and also greatly reduces the chattering and noise.

I have herein disclosed one simple and practical embodiment of the invention which in practice has been found to satisfactorily effectuate the stated purpose or object thereof; but manifestly detail modifications and variations may be resorted to within the par view of the invention as defined in the appended claims.

I claim:

1. In a stock bar feeder of the type described, the combination of a casing mounted for sliding movement on a guide, a floating sleeve in said casing, a bar gripping member journaled in said sleeve, and spring-actuated means in said casing opposing lateral displacement of said sleeve under lateral vibrations of the stock bar.

2. in a stock bar feeder of the type described, the combination of a casing mounted for sliding movement on a guide, a bar gripping member rotatable in said casing, and a group of spaced radial springs mounted in said casing, exerting an inward thrust on said gripping member and serving to cushion the lateral vibrations imparted to said gripping member by the rotating stock bar.

3. In a stock bar feeder of the type described, the combination of acasing mounted for sliding movement on a guide, a floating bearing sleeve in said casing, a bar gripping member journaled in said sleeve, and a group of spaced radial spring plungers mounted in said casing at their inner ends abutting against said sleeve and serving to cushion the lateral vibrations imparted to said gripping member and sleeve by the rotating stock bar.

4. In a stock bar feeder of the type described, the combination of a casing mounted for sliding movement on a guide, a floating bearing sleeve in said casing formed with flat surfaces on its outer periphery, a bar gripping member journaled in said sleeve, and a group of spaced radial thrust spring plungers mounted in said casing at their inner ends seated on said flat surfaces and serving to hold said sleeve against rotation and cushion the lateral vibrations imparted to said gripping member and sleeve by the rotating stock bar.

5. In a stock bar feeder of the type described, the combination of acasing mounted for sliding movement on a guide, a floating bearing sleeve in said casing, a barrel journaled in said sleeve, heads on said barrel overlapping the ends of said sleeve and casing, a 1 5 group of spaced radial thrust spring plungers mounted in said casing at their inner ends bearing on said sleeve, and a group of screw threaded clamp screws mounted in one of said heads at their inner ends adapted to grip the stock bar.

RALPH J. MILLER. 

